# 创建一个空字典
alien_0 = {}

# 添加键——值对
alien_0['color'] = 'green'
alien_0['points'] = 5

# 使用字典
print(alien_0)
print("The alien is " + alien_0['color'] + ".")

# 修改字典的值
alien_0['color'] = 'yellow'

print(alien_0)
print("The alien is now " + alien_0['color'] + ".")